Dr Mokoena believes that people who are under stress will develop more colds than people who are not under stress.When he randomly selects 10 participants and exposes them to high levels of stress, he finds that 9 of the participants develop colds.Based on these results he concludes that stress causes an increase in colds.Dr Mokoena's reasoning may be flawed because in this study

Question

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Dr Mokoena's study lacks a control group for comparison, which means there is no way to know if the high levels of stress were actually the cause of the increase in colds. There could be other factors at play that could have influenced the results. Without a control group, it is difficult to draw a causal relationship between stress and colds.

Dr Mokoena Believes That People Who Are Under Stress Will